import Swal from 'sweetalert2'
import { loginSchema, getFirstZodError, getFieldErrors } from '~~/lib/validations/auth'

export function useLogin () {
  const { signIn } = useAuth()
  const router = useRouter()
  const route = useRoute()

  const email = ref('')
  const password = ref('')
  const turnstileToken = ref<string | null>(null)
  const turnstileRef = ref<{ reset: () => void } | null>(null)
  const fieldError = ref<Record<string, string>>({})
  const loading = ref(false)

  const callbackUrl = computed(() => (route.query.callbackUrl as string) || '/')

  async function onSubmit () {
    fieldError.value = {}
    const parsed = loginSchema.safeParse({ email: email.value, password: password.value })
    if (!parsed.success) {
      fieldError.value = getFieldErrors(parsed.error)
      await Swal.fire({ icon: 'error', title: 'Doğrulama hatası', text: getFirstZodError(parsed.error) })
      return
    }
    if (!turnstileToken.value) {
      await Swal.fire({ icon: 'warning', title: 'Güvenlik doğrulaması', text: 'Lütfen güvenlik kutusunu işaretleyin.' })
      return
    }
    loading.value = true
    try {
      const result = await signIn('credentials', {
        email: email.value,
        password: password.value,
        turnstile_token: turnstileToken.value,
        callbackUrl: callbackUrl.value,
      })
      if (result?.error) {
        const msg = result.error === 'CredentialsSignin' ? 'E-posta veya şifre hatalı.' : String(result.error)
        await Swal.fire({ icon: 'error', title: 'Giriş başarısız', text: msg })
        turnstileRef.value?.reset()
        turnstileToken.value = null
        return
      }
      await Swal.fire({ icon: 'success', title: 'Giriş başarılı', timer: 1500, showConfirmButton: false })
      if (result?.url) await router.push(result.url)
    } catch (e: unknown) {
      const msg = e instanceof Error ? e.message : 'Giriş yapılamadı.'
      await Swal.fire({ icon: 'error', title: 'Hata', text: msg })
      turnstileRef.value?.reset()
      turnstileToken.value = null
    } finally {
      loading.value = false
    }
  }

  async function signInWith (provider: 'github' | 'google') {
    loading.value = true
    try {
      await signIn(provider, { callbackUrl: callbackUrl.value })
    } catch (e: unknown) {
      const msg = e instanceof Error ? e.message : 'Giriş yapılamadı.'
      await Swal.fire({ icon: 'error', title: 'Hata', text: msg })
    } finally {
      loading.value = false
    }
  }

  return {
    email,
    password,
    turnstileToken,
    turnstileRef,
    fieldError,
    loading,
    callbackUrl,
    onSubmit,
    signInWith,
  }
}